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File:Priestley.jpg|thumb|250px|Priestley by Ellen Sharples (1794)McLachlan (1983), 28–30.|alt=Quarter-length portrait of a man in a black coat against a purple and blue curtain backdrop. '''Joseph Priestley''' (;[http://www.collinsdictionary.com/dictionary/american/priestley "Priestley"]: ''Collins English Dictionary'' – Complete & Unabridged 2012 Digital Edition. – 6 February 1804) was an 18th-century English theologian, English Dissenters|dissenting clergyman, Natural philosophy|natural philosopher, chemistry|chemist, educator, and Liberalism|Liberal Political philosophy|political theorist who published over 150 works. He is usually credited with the discovery of oxygen, having isolated it in its gaseous state, although...
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